The principal point of this discussion is John Davidson's assertion that we assume an isotropic stress state prior to ice loading. We are well aware of the fact that in-situ stress states in the brittle crust are generally anisotropic, and one of us (Mark Zoback) has published extensively on this topic (e.g., Zoback and Zoback, 1980, 1989; Zoback and Healy, 1984, 1992; Townend and Zoback, 2000; Wiprut and Zoback, 2000; Zoback et al., 2002).

We state on p. 498–499 (Grollimund and Zoback, 2003) that tectonic forces are left out of the...

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